5.15-stable review patch. If anyone has any objections, please let me know.
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From: Simon Ser contact@emersion.fr
[ Upstream commit 2b7947bd32e243c52870d54141d3b4ea6775e63d ]
The driver might pull connectors which weren't submitted by user-space into the atomic state. For instance, intel_dp_mst_atomic_master_trans_check() pulls in connectors sharing the same DP-MST stream. However, if the connector is unregistered, this later fails with:
[ 559.425658] i915 0000:00:02.0: [drm:drm_atomic_helper_check_modeset] [CONNECTOR:378:DP-7] is not registered
Skip the unregistered connector check to allow user-space to turn off connectors one-by-one.
See this wlroots issue: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3407
Previous discussion: https://lore.kernel.org/intel-gfx/Y6GX7z17WmDSKwta@ideak-desk.fi.intel.com/
Signed-off-by: Simon Ser contact@emersion.fr Cc: stable@vger.kernel.org Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Reviewed-by: Lyude Paul lyude@redhat.com Cc: Jani Nikula jani.nikula@intel.com Cc: Imre Deak imre.deak@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20231005131623.114379-1-contac... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_atomic_helper.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -285,7 +285,8 @@ static int update_connector_routing(struct drm_atomic_state *state, struct drm_connector *connector, struct drm_connector_state *old_connector_state, - struct drm_connector_state *new_connector_state) + struct drm_connector_state *new_connector_state, + bool added_by_user) { const struct drm_connector_helper_funcs *funcs; struct drm_encoder *new_encoder; @@ -336,9 +337,13 @@ update_connector_routing(struct drm_atom * there's a chance the connector may have been destroyed during the * process, but it's better to ignore that then cause * drm_atomic_helper_resume() to fail. + * + * Last, we want to ignore connector registration when the connector + * was not pulled in the atomic state by user-space (ie, was pulled + * in by the driver, e.g. when updating a DP-MST stream). */ if (!state->duplicated && drm_connector_is_unregistered(connector) && - crtc_state->active) { + added_by_user && crtc_state->active) { DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] is not registered\n", connector->base.id, connector->name); return -EINVAL; @@ -610,7 +615,10 @@ drm_atomic_helper_check_modeset(struct d struct drm_connector *connector; struct drm_connector_state *old_connector_state, *new_connector_state; int i, ret; - unsigned int connectors_mask = 0; + unsigned int connectors_mask = 0, user_connectors_mask = 0; + + for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) + user_connectors_mask |= BIT(i);
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { bool has_connectors = @@ -675,7 +683,8 @@ drm_atomic_helper_check_modeset(struct d */ ret = update_connector_routing(state, connector, old_connector_state, - new_connector_state); + new_connector_state, + BIT(i) & user_connectors_mask); if (ret) return ret; if (old_connector_state->crtc) {